Adding SVN diff that includes the patch included above and a patch for the docs, mentioning that now the language attribute can be set, and otherwise defaults to the project-wide setting for LANGUAGE_CODE.

It would be very nice if this could get put into Django 1.3. I've had to hack this into shape myself to get it working for the new Inkscape website which can make news feeds for any supported language, using request.LANGUAGE_CODE rather than settings.LANGUAGE_CODE (seems to me that that is going to be a common request; I think it would be good if Feed stored the Request - but that's another ticket).